init commit take 2

source/fatfs/sdmmc/common.h

@@ -0,0 +1,15 @@
+#pragma once
+
+#include <stdint.h>
+#include <stddef.h>
+#include <stdbool.h>
+
+#define u8 uint8_t
+#define u16 uint16_t
+#define u32 uint32_t
+#define u64 uint64_t
+
+#define vu8 volatile u8
+#define vu16 volatile u16
+#define vu32 volatile u32
+#define vu64 volatile u64